Boat seat base



FIG. 1 is a perspective view of boat seat base showing my new design.The broken lines are for illustrative purposes only and form no part ofthe claimed design.

FIG. 2 is a side view thereof;

FIG. 3 is an opposite side view thereof;

FIG. 4 is an end view thereof;

FIG. 5 is an opposite end view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The ornamental design for boat seat base, as shown and described.